InStream Conservation

Why We Need Deep Pool Holding Habitat In Our NW Rivers

Why We Need Deep Pool Holding Habitat In Our NW Rivers

  • In the summer during critical low flows and high temperatures, deep holding plunge pools provide cool upwelling oxygenated water, cover, and feeding areas for juveniles and resting places for returning wild salmon and steelhead.
  • Upwelling pressure from the groundwater and deep pools enhance the flows through the tailwater gravel, where wild salmon and steelhead spawn, increasing the survival of eggs and emerging fry.
  • When creating deep holding pool habitat wood and rock is used to mimic the natural environment, restore proper stream functioning, remove stress from banks and move the energy of the current to the middle of the stream. This helps the banks to heal and grow new vegetation for cover and stability.
  • Deep pool habitat is designed to function in bank full conditions, as well as low summer flow conditions while supporting fish passage for adult and juvenile salmon and steelhead.
  • Combining stabilizing deep pools, riffle run tail out habitat with increasing nutrient distribution either with salmon carcass or analogue pellets, plus restoring side channel holding and rearing areas for juvenile fish, can go a long way toward improving our threatened/endangered wild salmon and steelhead populations.
  • Stream restoration projects need to be monitored for:

  • How successful the project is in providing deep cool water pools and spawning/rearing habitat.
  • A transparent audited monitored system of how the project has met its goals overtime, and how much the taxpayer as well as the fish have benefited.

Restoration Technologies

The Ancient Roman Arch concept using gravity and shaped wood and rock
The Ancient Roman Arch concept using gravity and shaped wood and rock, is used to create oxygenated, cool ground water recharged, plunge pools and cover for large fish and fry.

Conceptual Drawing of Rock Vane

Conceptual Drawing of Rock Vane


J-Hook-Rock
Root Wads and J Hook Rock Vane direct flow to the center of the channel taking stress off banks allowing re-vegetation.

Drawing-J-Hook-Rock

(Click on images to open larger)

WEB | SEO